Bunn Easy Clear Water Quality System reduces lime scale formation from hard water in applications where water is either heated or evaporated. This system will extend the life and improve the efficiency of coffee brewers, espresso machines and steamers. Recommended for use in combination with an EQHP10, 25, 54 (non-L) system. BUNN recommends regularly scheduled maintenance and replacement of the filter cartridge(s) in order for the product to perform as advertised/sold. Change the filter cartridge at least every 6 months. Do not use with water that is micro biologically unsafe or of unknown quality without adequate disinfection before or after the system.